Ears are like people - each one unique and different. That's what makes SmartFit™ such a marvel of user-friendly design. The only multiple-use earplug with Conforming Material Technology,™ SmartFit™ uses body heat to adapt to the shape of the ear canal for a comfortable, personalized fit. With a detachable cord system, HearPack® carry case and special application styles available, it's the ultra-smart choice for today's diverse workplace. NRr 25 rating.